CVE-2026-35523
Authentication bypass in strawberry-graphql via legacy graphql-ws WebSocket subprotocol
CVSS Score
7.5
EPSS Score
0.1%
EPSS Percentile
29th
Strawberry GraphQL is a library for creating GraphQL APIs. Strawberry up until version 0.312.3 is vulnerable to an authentication bypass on WebSocket subscription endpoints. The legacy graphql-ws subprotocol handler does not verify that a connection_init handshake has been completed before processing start (subscription) messages. This allows a remote attacker to skip the on_ws_connect authentication hook entirely by connecting with the graphql-ws subprotocol and sending a start message directly, without ever sending connection_init. This vulnerability is fixed in 0.312.3.
| CWE | CWE-306 |
| Vendor | strawberry-graphql |
| Product | strawberry |
| Published | Apr 7, 2026 |
| Last Updated | Apr 9, 2026 |
Stay Ahead of the Next One
Get instant alerts for strawberry-graphql strawberry
Be the first to know when new high vulnerabilities affecting strawberry-graphql strawberry are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
strawberry-graphql / strawberry
< 0.312.3